I have used tons of 300MP. It is great in nearly anything that H110/296 works in. As far as peak performance it will give more velocity with a lot of bullets than H110 but has a very narrow loading window. It is especial good in the 480 Ruger and 45 Colt with heavy bullets.

"A quiet hit in the right place is better than a loud miss in the wrong place followed by 10 more shots on the run"

I was a handgun hunter, when handgun wasn't cool.....